The gender wage gap is 91% not 77% and the reasons have very little to do with sexism

(W)e’re still not close to measuring women “doing the same work as men.” For that, we’d have to adjust for many other factors that go into determining salary. Economists Francine Blau and Lawrence Kahn did that in a recent paper, “The Gender Pay Gap.”.”They first accounted for education and experience. That didn’t shift the gap very much, because women generally have at least as much and usually more education than men, and since the 1980s they have been gaining the experience. The fact that men are more likely to be in unions and have their salaries protected accounts for about 4 percent of the gap. The big differences are in occupation and industry. Women congregate in different professions than men do, and the largely male professions tend to be higher-paying. If you account for those differences, and then compare a woman and a man doing the same job, the pay gap narrows to 91 percent. So, you could accurately say in that Obama ad that, “women get paid 91 cents on the dollar for doing the same work as men.”

The point here is not that there is no wage inequality. But by focusing our outrage into a tidy, misleading statistic we’ve missed the actual challenges. It would in fact be much simpler if the problem were rank sexism and all you had to do was enlighten the nation’s bosses or throw the Equal Pay Act at them. But the 91 percent statistic suggests a much more complicated set of problems. Is it that women are choosing lower-paying professions or that our country values women’s professions less? And why do women work fewer hours? Is this all discrimination or, as economist Claudia Goldin likes to say, also a result of “rational choices” women make about how they want to conduct their lives.

Goldin and Lawrence Katz have done about as close to an apples-to-apples comparison of men’s and women’s wages as exists. (They talk about it here in a Freakonomics discussion.) They tracked male and female MBAs graduating from the University of Chicago from 1990 to 2006. First they controlled for previous job experience, GPA, chosen profession, business-school course and job title. Right out of school, they found only a tiny differential in salary between men and women, which might be because of a little bit of lingering discrimination or because women are worse at negotiating starting salaries. But 10 to 15 years later, the gap widens to 40 percent, almost all of which is due to career interruptions and fewer hours. The gap is even wider for women business school graduates who marry very high earners. (Note: Never marry a rich man).

If this midcareer gap is due to discrimination, it’s much deeper than “male boss looks at female hire and decides she is worth less, and then pats her male colleague on the back and slips him a bonus.” It’s the deeper, more systemic discrimination of inadequate family-leave policies and childcare options, of women defaulting to being the caretakers. Or of women deciding that are suited to be nurses and teachers but not doctors. And in that more complicated discussion, you have to leave room at least for the option of choice—that women just don’t want to work the same way men do.(Slate article)

In short, the gap is accounted for by many things, not just sexism. And those reasons include live choices women make, careers they prefer, becoming single parents, and yes a certain amount of discrimination. Because of these sex-bound factors, it's very unlikely the gap will ever be entirely eliminated.

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Wage parity laws have become much stricter in Nordic countries in the last few years and lo and behold their economies haven't suffered at all for it. More women in fact work in higher level positions. They actively encourage both parents to divide up maternity/paternity leave, provide generous daycare and also actively combat sexist environments in the work place in general to encourage women to make long term career choices. Making HR decisions based on suspecting a woman is planning to have a baby is illegal. Women and men are rather close to getting the same money for the same hourly work.

This has been a rather successful policy and central European countries and to an extent southern European countries are adopting them. All the power to them.